2235 - 2245 Fixed typo in Maps documentation (0.17) (quii#319)

Author: chynkm

maps.md

@@ -409,7 +409,7 @@ func (d Dictionary) Add(word, definition string) error {
 Now we get two more errors. We are still modifying the value, and returning a `nil` error.
 
 ```
-dictionary_test.go:43: got error '%!s(<nil>)' want 'cannot add word because it already exists'
+dictionary_test.go:43: got error '%!q(<nil>)' want 'cannot add word because it already exists'
 dictionary_test.go:44: got 'new test' want 'this is just a test'
 ```
 
@@ -562,7 +562,7 @@ We added our own error type and are returning a `nil` error.
 With these changes, we now get a very clear error:
 
 ```
-dictionary_test.go:66: got error '%!s(<nil>)' want 'cannot update word because it does not exist'
+dictionary_test.go:66: got error '%!q(<nil>)' want 'cannot update word because it does not exist'
 ```
 
 ## Write enough code to make it pass